diff --git a/network-poc/tests/model-benchmark.mjs b/network-poc/tests/model-benchmark.mjs
index dff8e31..19b2535 100644
--- a/network-poc/tests/model-benchmark.mjs
+++ b/network-poc/tests/model-benchmark.mjs
@@ -196,6 +196,7 @@ RULES:
 - SQLAlchemy 2.0: DeclarativeBase + Mapped + mapped_column (not Column())
 - Python type unions: str | None (not Optional[str])
 - Tests: unique descriptive data per test, NOT generic "test_title" strings
+- Tests: PUT/update test data MUST include ALL required (non-nullable) fields, not just the field being updated
 - Absolute imports only (from models import ..., from schemas import ...)
 - NO markdown fences inside file content — just raw code
 - Only test endpoints that exist in main.py — no extra tests`;